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Home > Education > Acupuncture Point Location > Urinary Bladder Meridian > UB 40

Urinary Bladder 40

Chinese Name: Weizhong (English translation: Supporting Middle)

Location:  Midpoint of the transverse crease of the popliteal fossa, between the tendons m. biceps femoris and m. semitendinosus.

Classification:  He-Sea point of the Urinary Bladder
Command Point of the low back


  • Lumbar pain, spasm and weakness of the lower extremities
  • Erysipelas, rash, general pruritus, furuncle, carbuncle on the back
  • Abdominal pain, vomiting, diarrhea
  • Enuresis, dysuria

Functions: Clears Heat, resolves Dampness, benefits the lumbar area and knees, cools the Blood, clears Summer-Heat, activates the meridian, relieves pain.

Notes: UB 40 is an excellent point for any low back condition, acute or chronic. It is also known to help skin conditions. He-Sea points are where the qi of the meridian collects and goes deep into the body. He-sea points are known to indicated treat rebellious qi and diarrhea.

Needling: Perpendicular insertion 1.0 - 1.5 cun, or prick the popliteal vein with the three-edged needle to cause bleeding.

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